Search found 30 matches
- Thu Dec 06, 2018 3:44 pm
- Forum: Naming
- Topic: Name to Formula
- Replies: 1
- Views: 293
Re: Name to Formula
If there are multiple ligands you should put them in alphabetical order when naming the compound.
- Thu Dec 06, 2018 1:44 pm
- Forum: Amphoteric Compounds
- Topic: Amphoteric vs Amphiprotic
- Replies: 4
- Views: 871
Re: Amphoteric vs Amphiprotic
Amphoteric means a substance can either act as an acid or a base. Amphiprotic means a substance can either donate or accept hydrogen ions.
- Thu Dec 06, 2018 1:42 pm
- Forum: Conjugate Acids & Bases
- Topic: Conjugate Acid/Base
- Replies: 3
- Views: 435
Re: Conjugate Acid/Base
A conjugate acid is a species formed by the reception of a proton (H+) by a base, so basically it is a base with a hydrogen ion added to it. On the other hand, a conjugate base is what is left over after an acid has donated a proton during a chemical reaction.
- Sun Dec 02, 2018 7:32 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Charge on ligands
- Replies: 2
- Views: 341
Re: Charge on ligands
I assume we will have to calculate or memorize the charges of ligands on the test but, I haven't heard Dr. Lavelle say anything in regards to that yet
- Sun Dec 02, 2018 7:24 pm
- Forum: Hybridization
- Topic: Hybridization of bonds abbreviation
- Replies: 2
- Views: 350
Re: Hybridization of bonds abbreviation
I believe they are the same because the 2 in front just means that there are two sp2 hybridized orbitals
- Sun Dec 02, 2018 7:22 pm
- Forum: Hybridization
- Topic: hybridization
- Replies: 13
- Views: 1852
Re: hybridization
I usually look at how many other atoms are being attached to the central atom and if it is say 3 other atoms the hybridization is just one less; sp2. For 5 and 6atoms attached to the central atom you just have to remember you are using d orbitals so it will always have an sp3 and then however many d...
- Sun Nov 25, 2018 7:38 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: Dipole-Dipole forces
- Replies: 3
- Views: 405
Dipole-Dipole forces
When looking at a molecule, is the only way to tell that it has dipole-dipole forces by determining if it is a polar molecule?
- Sun Nov 25, 2018 7:34 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Final Exam
- Replies: 22
- Views: 1748
Re: Final Exam
I don't think Dr. Lavelle has stated what the final exam format will be yet and I haven't seen anything on the website either
- Sun Nov 25, 2018 5:22 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 6th edition 4.13
- Replies: 3
- Views: 427
Re: 6th edition 4.13
By drawing the lewis structures you should be able to tell the shape of the molecule and the bond angles correlate with the shape. For example trigonal planar has bond angles of 120 degrees and tetrahedral has bond angles of 109.5 degrees
- Sun Nov 18, 2018 3:55 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Electrostatic potential
- Replies: 2
- Views: 325
Electrostatic potential
Can someone please explain what electrostatic potential means and how it relates to shape and such
- Sun Nov 18, 2018 3:47 pm
- Forum: Hybridization
- Topic: Hybridization
- Replies: 2
- Views: 302
Re: Hybridization
Orbital hybridization is the concept of mixing atomic orbitals into new hybrid orbitals (with different energies and shaped than the component atomic orbitals) suitable for the pairing of electrons to form chemical bonds. To calculate hybridization you add the number of bonded atoms and the lone pai...
- Sun Nov 18, 2018 3:39 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: cis and trans dichloroethene
- Replies: 3
- Views: 543
Re: cis and trans dichloroethene
Cis stands for same side dipoles and trans stands for different side dipoles. Because Cis-dichloroethane has dipoles on the same side the molecule is polar. The trans-dicholoroethane is non-polar because the dipoles cancel out on different sides.
- Sun Nov 11, 2018 7:28 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: trigonal pyramidal
- Replies: 3
- Views: 293
Re: trigonal pyramidal
It is the best form because the bonding pairs and lone pairs are as far away as possible
- Sun Nov 11, 2018 7:17 pm
- Forum: Electronegativity
- Topic: Radius
- Replies: 13
- Views: 1636
Re: Radius
as atomic radius increases electronegativity decreases because there is less attraction between the nucleus and shared electrons as atomic radius increases
- Sun Nov 11, 2018 7:07 pm
- Forum: Bond Lengths & Energies
- Topic: Bond Length
- Replies: 9
- Views: 1153
Re: Bond Length
I think it is the middle or average of the bond lengths so it would be 105
- Sun Nov 04, 2018 7:59 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: 2.43 Tungsten
- Replies: 1
- Views: 226
Re: 2.43 Tungsten
The 6s orbital is lower in energy relative to the 5d orbital than the 5s is relative to 4d or the 4s to 3d. Thus, the energy gained by not shoving two electrons into the 6s orbital, plus that from a half-filled 5d subshell, is not enough to compensate for promoting an electron from 6s to 5d.
- Sun Nov 04, 2018 7:53 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Electron Configuration
- Replies: 4
- Views: 561
Re: Electron Configuration
The 4s2 orbital is filled first, but when ions are formed the s orbital electrons are the first to go because they are at a higher energy state.
- Sun Nov 04, 2018 7:48 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: How to write P and D Orbitals
- Replies: 1
- Views: 386
Re: How to write P and D Orbitals
This is the correct way to write it because the 4s orbital has higher energy than the 3d orbital it should be written after.
- Mon Oct 22, 2018 8:38 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: How do I identify excited state through the electronic configuration
- Replies: 5
- Views: 5037
Re: How do I identify excited state through the electronic configuration
An atom is in an excited state if the electron configuration is incorrect. Like for A if there were two up arrows in two separate boxes in the 2p orbitals it would be in its ground state. For C it is excited because there is a electron in 2p instead of a second electron in the 2s. The only element i...
- Mon Oct 22, 2018 8:33 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Heisenberg Indeterminacy Post Assessment #20
- Replies: 2
- Views: 385
Re: Heisenberg Indeterminacy Post Assessment #20
all you have to do is plug in the velocity found in the problem above into the equation Ek=1/2mv^2 and you will get the uncertainty in KE
- Mon Oct 22, 2018 8:27 pm
- Forum: DeBroglie Equation
- Topic: wavelike properties
- Replies: 4
- Views: 665
Re: wavelike properties
Dr. Lavelle stated that any wavelength smaller than about 1.0x10^-18 wouldn't be detectable. Basically anything besides subatomic particles have wavelengths that are too small to detect.
- Sun Oct 21, 2018 5:48 pm
- Forum: Properties of Electrons
- Topic: Test question
- Replies: 6
- Views: 638
Test question
Does anybody know if we will have to write out ground states of electrons even though we never covered this in lecture?
- Sun Oct 21, 2018 5:46 pm
- Forum: Properties of Electrons
- Topic: Atomic Spectra
- Replies: 2
- Views: 268
Atomic Spectra
Does somebody know what the correct answer to number 12 on the atomic spectra post-module is? All of the answers seem very similar and this is why I am a bit confused
- Sun Oct 21, 2018 5:33 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Quantum numbers
- Replies: 5
- Views: 592
Quantum numbers
If n=4 l=3 and ml=-3,-2,-1,0,1,2,3 where is the electron located? would the correct answer be 4f?
- Sun Oct 14, 2018 8:15 pm
- Forum: Properties of Electrons
- Topic: Rydberg formula
- Replies: 5
- Views: 474
Rydberg formula
How to you use the Rydberg Formula to calculate wavelength of radiation generated by the transition from n=4 to n=2?
- Sun Oct 14, 2018 7:52 pm
- Forum: Properties of Electrons
- Topic: Wave Properties of Electrons
- Replies: 2
- Views: 152
Wave Properties of Electrons
Could someone explain what constructive and destructive interference have to do with diffraction patterns and electrons having wave like properties. I am confused by what the importance is of the two types of interference
- Sun Oct 14, 2018 7:00 pm
- Forum: Trends in The Periodic Table
- Topic: 6th Edition Ch.2 Number 93
- Replies: 2
- Views: 165
Re: 6th Edition Ch.2 Number 93
The answer in the back of the book states that A=Cl, B=Na, C=Cl- and D=Na+. You are right about chlorine having the smaller atomic radius
- Wed Oct 03, 2018 9:20 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Hydrogen Molar Mass HW E9
- Replies: 5
- Views: 978
Re: Hydrogen Molar Mass HW E9
I usually just use 1.008 for the molar mass of hydrogen but it all depends on how precise you want your answer to be. Your answer is close enough to see that you did the problem correctly, so I think it is okay.
- Wed Oct 03, 2018 9:16 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: E.25 part a
- Replies: 2
- Views: 242
Re: E.25 part a
Yes I believe it is just asking for the number of molecules. Formula units is just a label similar to atoms or molecules
- Wed Oct 03, 2018 9:07 pm
- Forum: Limiting Reactant Calculations
- Topic: limiting reactant problem
- Replies: 3
- Views: 197
limiting reactant problem
If you have the equation 2A + 1B = 3C and 1 mole of A is mixed with 1 mole of B, which is the limiting reactant? Please explain as well